Treatment of o-[2-furyl]cycloheptatrienylbenzenes with triphenylmethyl tetrafluoroborate (trityl salt) in dichloromethane gave β-(10-benz[a]azulenyl)-α,β-unsaturatedketones in one-pot, in which a novelcyclization involving intramolecular attack of tropylium ion to the α-position of furan ring is postulated.
在二氯甲烷中用四氟硼酸三苯甲基酯(三苯甲基盐)处理邻-[2-呋喃基]环庚三烯基苯,得到一锅内β-(10-苯并[ a ] azulenyl)-α,β-不饱和酮,其中涉及分子内的新型环化反应假定对yl离子对呋喃环的α-位的侵袭。